Where does “Oostzee” come from?

Oostzee (Dutch) comes from Dutch zee, from Middle Dutch sêe, from Old Dutch sēo, from Proto-West Germanic saiwi, from Proto-Germanic saiwiz, from Proto-Germanic sīhwaną, from Proto-Indo-European seykʷ-, from Proto-Indo-European sey- — to be wet; dribble; run; to stretch one's arm;...

Ancestry of “Oostzee”, step by step

Oostzee traces back through two separate lines of ancestry.

via Dutch zee

StepLanguageWordMeaning
1Dutchzeesea
2Middle Dutchsêesea
3Old Dutchsēosea
4Proto-West Germanicsaiwisea
5Proto-Germanicsaiwizsea, ocean
6Proto-Germanicsīhwanąto filter
7Proto-Indo-Europeanseykʷ-to moisten; to filter
8Proto-Indo-Europeansey-to be wet; dribble; run; to stretch one's arm;...

via Dutch oost

StepLanguageWordMeaning
1Dutchoosteast; eastwards
2Middle Dutchoost
3Old Dutchōst
4Old Norseaustreast
5Proto-Germanicaustrąeast; east, eastward
6Proto-Germanicaustrazeast, eastern
7Proto-Indo-European*h₂éwsterosin the direction of dawn, east

Words derived from “Oostzee

Every word from Proto-Indo-European sey-